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Posted to common-dev@hadoop.apache.org by "Albert Chern (JIRA)" <ji...@apache.org> on 2007/01/25 00:22:49 UTC
[jira] Created: (HADOOP-927) MapReduce is Broken for User-Defined
Classes
MapReduce is Broken for User-Defined Classes
--------------------------------------------
Key: HADOOP-927
URL: https://issues.apache.org/jira/browse/HADOOP-927
Project: Hadoop
Issue Type: Bug
Components: mapred
Affects Versions: 0.11.0
Reporter: Albert Chern
Priority: Critical
Checked out trunk today and all of my jobs with a user-defined class as a map output value class fail with a ClassNotFoundException. Here's the stack trace:
java.lang.RuntimeException: java.lang.RuntimeException: java.lang.ClassNotFoundException: test.StringWrapper
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:344)
at org.apache.hadoop.mapred.JobConf.getMapOutputValueClass(JobConf.java:406)
at org.apache.hadoop.mapred.ReduceTaskRunner.(ReduceTaskRunner.java:339)
at org.apache.hadoop.mapred.ReduceTask.createRunner(ReduceTask.java:91)
at org.apache.hadoop.mapred.TaskTracker$TaskInProgress.launchTask(TaskTracker.java:983)
at org.apache.hadoop.mapred.TaskTracker.launchTaskForJob(TaskTracker.java:366)
at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:359)
at org.apache.hadoop.mapred.TaskTracker.startNewTask(TaskTracker.java:823)
at org.apache.hadoop.mapred.TaskTracker.offerService(TaskTracker.java:510)
at org.apache.hadoop.mapred.TaskTracker.run(TaskTracker.java:852)
at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:1494)
I haven't looked deeply into it, but I would guess that the problem is in the constructor of ReduceTaskRunner where it attempts to create a SequenceFile.Sorter for the map output value class. It's probably done in the main TaskTracker JVM process, so external libraries are not on its classpath.
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[jira] Commented: (HADOOP-927) MapReduce is Broken for User-Defined
Classes
Posted by "liupengfei (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12510078 ]
liupengfei commented on HADOOP-927:
-----------------------------------
This issue is still exist in hadoop-0.13.0:
java.lang.RuntimeException: java.lang.RuntimeException: java.lang.ClassNotFoundException: com.qnsoft.asm.SMS
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:351)
at org.apache.hadoop.mapred.JobConf.getMapOutputValueClass(JobConf.java:407)
at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.(MapTask.java:308)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:123)
at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1707)
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: com.qnsoft.asm.SMS
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:331)
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:343)
... 4 more
Caused by: java.lang.ClassNotFoundException: com.qnsoft.asm.SMS
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:242)
at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:318)
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:329)
... 5 more
I have defined SMS extends Writable, it just cannot run under hadoop-0.13.0,but ok in 0.9.2.
> MapReduce is Broken for User-Defined Classes
> --------------------------------------------
>
> Key: HADOOP-927
> URL: https://issues.apache.org/jira/browse/HADOOP-927
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.11.0
> Reporter: Albert Chern
> Priority: Critical
>
> Checked out trunk today and all of my jobs with a user-defined class as a map output value class fail with a ClassNotFoundException. Here's the stack trace:
> java.lang.RuntimeException: java.lang.RuntimeException: java.lang.ClassNotFoundException: test.StringWrapper
> at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:344)
> at org.apache.hadoop.mapred.JobConf.getMapOutputValueClass(JobConf.java:406)
> at org.apache.hadoop.mapred.ReduceTaskRunner.(ReduceTaskRunner.java:339)
> at org.apache.hadoop.mapred.ReduceTask.createRunner(ReduceTask.java:91)
> at org.apache.hadoop.mapred.TaskTracker$TaskInProgress.launchTask(TaskTracker.java:983)
> at org.apache.hadoop.mapred.TaskTracker.launchTaskForJob(TaskTracker.java:366)
> at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:359)
> at org.apache.hadoop.mapred.TaskTracker.startNewTask(TaskTracker.java:823)
> at org.apache.hadoop.mapred.TaskTracker.offerService(TaskTracker.java:510)
> at org.apache.hadoop.mapred.TaskTracker.run(TaskTracker.java:852)
> at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:1494)
> I haven't looked deeply into it, but I would guess that the problem is in the constructor of ReduceTaskRunner where it attempts to create a SequenceFile.Sorter for the map output value class. It's probably done in the main TaskTracker JVM process, so external libraries are not on its classpath.
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[jira] Resolved: (HADOOP-927) MapReduce is Broken for User-Defined
Classes
Posted by "Doug Cutting (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-927?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Doug Cutting resolved HADOOP-927.
---------------------------------
Resolution: Duplicate
> MapReduce is Broken for User-Defined Classes
> --------------------------------------------
>
> Key: HADOOP-927
> URL: https://issues.apache.org/jira/browse/HADOOP-927
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.11.0
> Reporter: Albert Chern
> Priority: Critical
>
> Checked out trunk today and all of my jobs with a user-defined class as a map output value class fail with a ClassNotFoundException. Here's the stack trace:
> java.lang.RuntimeException: java.lang.RuntimeException: java.lang.ClassNotFoundException: test.StringWrapper
> at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:344)
> at org.apache.hadoop.mapred.JobConf.getMapOutputValueClass(JobConf.java:406)
> at org.apache.hadoop.mapred.ReduceTaskRunner.(ReduceTaskRunner.java:339)
> at org.apache.hadoop.mapred.ReduceTask.createRunner(ReduceTask.java:91)
> at org.apache.hadoop.mapred.TaskTracker$TaskInProgress.launchTask(TaskTracker.java:983)
> at org.apache.hadoop.mapred.TaskTracker.launchTaskForJob(TaskTracker.java:366)
> at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:359)
> at org.apache.hadoop.mapred.TaskTracker.startNewTask(TaskTracker.java:823)
> at org.apache.hadoop.mapred.TaskTracker.offerService(TaskTracker.java:510)
> at org.apache.hadoop.mapred.TaskTracker.run(TaskTracker.java:852)
> at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:1494)
> I haven't looked deeply into it, but I would guess that the problem is in the constructor of ReduceTaskRunner where it attempts to create a SequenceFile.Sorter for the map output value class. It's probably done in the main TaskTracker JVM process, so external libraries are not on its classpath.
--
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[jira] Commented: (HADOOP-927) MapReduce is Broken for User-Defined
Classes
Posted by "Albert Chern (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12473524 ]
Albert Chern commented on HADOOP-927:
-------------------------------------
This issue was the same as Hadoop-964 so it can be closed now.
> MapReduce is Broken for User-Defined Classes
> --------------------------------------------
>
> Key: HADOOP-927
> URL: https://issues.apache.org/jira/browse/HADOOP-927
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.11.0
> Reporter: Albert Chern
> Priority: Critical
>
> Checked out trunk today and all of my jobs with a user-defined class as a map output value class fail with a ClassNotFoundException. Here's the stack trace:
> java.lang.RuntimeException: java.lang.RuntimeException: java.lang.ClassNotFoundException: test.StringWrapper
> at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:344)
> at org.apache.hadoop.mapred.JobConf.getMapOutputValueClass(JobConf.java:406)
> at org.apache.hadoop.mapred.ReduceTaskRunner.(ReduceTaskRunner.java:339)
> at org.apache.hadoop.mapred.ReduceTask.createRunner(ReduceTask.java:91)
> at org.apache.hadoop.mapred.TaskTracker$TaskInProgress.launchTask(TaskTracker.java:983)
> at org.apache.hadoop.mapred.TaskTracker.launchTaskForJob(TaskTracker.java:366)
> at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:359)
> at org.apache.hadoop.mapred.TaskTracker.startNewTask(TaskTracker.java:823)
> at org.apache.hadoop.mapred.TaskTracker.offerService(TaskTracker.java:510)
> at org.apache.hadoop.mapred.TaskTracker.run(TaskTracker.java:852)
> at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:1494)
> I haven't looked deeply into it, but I would guess that the problem is in the constructor of ReduceTaskRunner where it attempts to create a SequenceFile.Sorter for the map output value class. It's probably done in the main TaskTracker JVM process, so external libraries are not on its classpath.
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